Molding apparatus.



R. R. RUST.

MOLDING APPARATUS.

APPLICATION FILED MAR. 2551913.

1, 1 1 9,727.. Patented Dec. 1, 1914.

2 SHEETS-SHEET 1.

QXH/lmmeo: 3w enter 0mm jm Mm THE NORRIS PETERS 6a., PHOTO-LITHQ, WASHINGTON, D. g,

R. E. RUST.

MOLDING APPARATUS.

APPLIOATION FILED MAR. 25, 1913.

1,1 19,727. Patented Dec. 1, 1914.

2 SHEETS-SHEET 2.

l Za JI 4? H 0 N m W H JV IF J H I I ll if I IT JP l J! J- II Al Al I JV J! H V. II 4F IF A? Al I V U== HE NORRIS PETERS C0..r'nu1u-u1Hu.. WASHING rON. D. c.

UNITED STATll PATENT oriuon.

ROBERT n. RUs'r, or new YORK, N. Y.

MOLDING APPARATUS.

Specification of Letters Patent. Patented De 1. 1914.

Application filed March 25, 1313. Serial No. 756,758.

To all whom it may concern:

Be it known that 1, ROBERT R. RUST, a citizen of the United States of America, and residing in the city, county, and State of Improved Molding Apparatus, of whichthe following is a specification.

My invention relates to molding apparatus and particularly to apparatus for filling and ramming sand in mold boxes, the object of my invention being to provide an installation adapted to effect the charging of the sand into the mold box in a simple and convenient manner and to ram the sand so as to eifect the compressionof the same to densities which differ in different portions 01 the flask according to predetermined desired conditions.

In the accompanying drawings, Figure 1 is a side elevation partially in transverse section showing my invention applied in connection with a jolt-ramming machine; Fig. 2 is a plan of the compressor; Fig. 3 is a longitudinal section through the mold box and compressor; Fig. 4 is a longitudinal section through a. compressor of modified form.

The installation here illustrated comprises a jolt-ramming table upon which a mold flask 11 is supported above the usual facing board 12. The flask is subdivided by longitudinal partitions13 into several compartments, in each of which a pair of patternsld is placed, although obviously but a single pattern to a flask could be employed when for any reason such practice is preferred. Bridgework 15 is provided in the upper portion of the flask in well understood manner, and recesses in the ends of the flask are formed to receive the prints 16 extending beyond the ends of the patterns. i

The j olt-ramming table 10 is here located midway between two uprights 17 of a frame which carries the overhead sand box 18 from which, through the gates 19, the sand is discharged into the mold. Side brackets 20 on the uprights support rails 21 for the traveling crane 22 by which the mold is brought to and removed from position on the ramming table. Above the crane a cross beam 23 is stretched to support a hoisting pulley 21 on which is wound the cable 25 by which a sand compactor 26 is raised from and lowered to position on the mold for a purpose about to be described.

New York, have invented a certain new and.

This compacto'r lying above the mold. and below the sand boxl8 is provided with an opening or openings 27 through which the sand drops by gravity to" the mold. End lugs 28 aflord means forthe attachment of the lifting yokes '29, while perforated corner lugs 30 serve to position thecompactor on the mold box, the corner pins 31 of which are adapted to pass-through the holes in the lugs;

In molding hollow articles'such as pipes the core which lies in the hollows formed by the prints isfairly heavy. Unless adequatesupport is afforded by the sand at the prints, there isdanger of the core settling in position and thereby spoiling the casting. This support'can be adequately supplied if thesand at the prints is sufficiently compacted, but if the mold as a whole is rammed to like compactness, the density of the sand in the main part of the mold becomes too great for perfect casting, for reasons well understood by those familiar with the art. It is for the purpose of compacting the sand to greater density at the prints than in the body of the mold'that, I provide the device above mentioned. This compactor, in the form shown in Figs. 1, 2 and 3, is provided on its lower face with a series of projections or pads 32 spaced apart to enterbetween the bridge-work 15 of the mold. The end pads 33, which overlie the prints 16, extend downward below the face of'the pads 32 in order to compact the sand to greater density around the prints.

In operation the'apparatus shown is used as follows: The crane 22 having dropped the flask 11 in position and moved out of the way, the gates 19 of the sand box 18 are opened and the sand discharged to the flask through thecompactor 26 which is now in the raised position shown in dotted lines in Fig. 1. The jolting table is set in operation 1 and the fiaskpartially rammed. After the sufiiciently rammed in the mold, the compactor is lifted and the flask removed by the crane. Obviously, if no additional compacting of the sand around the pattern is desired than is secured through the weight of the sand itself, the middle pads 82 may be omitted, as shown in Fig. 4. Here the compactor takes the form of a frame with end pads 34: only, to ram the sand around the prints. Should compression to varying degrees of density be desired in various parts of the mold, this could readily be effected by varying the depth of the pads accordingly, as will be readily understood. While the compactor may be made of any suitable material, it may be conveniently made from cast iron, the weight of which is a great aid to eliicient ramming. The particular structure shown is to be understood as merely an exemplary embodiment of my invention.

I claim as my invention 1. A. molding apparatus comprising a jolt ramming machine, an overhead sand bin and an interposed sand-compactor aper' tured to permit the discharge of the sand therethrough to the flask from the sand bin, and adapted to be lowered upon the sand in the mold.

2. A molding apparatuscomprising ajolt ramming machine, an overhead sand bin, a traveling crane for bringing and removing the flask to and from the jolt ramming machine, and a mold-compactor normally suspended above the travel of the crane and beneath the sand bin, said compactor being apertured to permit the discharge therethrough of the sand from the bin to the flask.

8. In a jolt ramming machine, a sand compactor comprising a grid frame temporarily adjustable upon the sand in the flask and having on its lower face pads lying in different planes and out of register in depth with the contour of the pattern whereby the sand is compacted to different densities in different parts of the flask.

l. In ajolt ramming machine, a flask having bridge work therein, in combination with a sand compactor comprising a grid frame temporarily adjustable upon the sand in the flask and having on its lower face pads spaced to enter between the cross members of the bridge work and lying in different planes and out of register in depth with the contour of the pattern whereby the sand is compacted to different densities in dilferentparts of the flask.

5. In a jolt-ramming machine, a flask for cored castings, in combination with a separate sand-compactor having pads which in adjusted position overlie the core prints and serve to compact the sand at the prints to greater density than at the body of the pattern.

6. A molding apparatus comprising a j olt-ramming machine, an overhead sand bin having discharge ports vertically above said machine, a vertically movable compressor grid arranged above said machine and apertured to permit the flow of sand therethrough to a flask placed on said machine, substantially as described.

7. A molding apparatus comprising a jolt-ramming machine, a stationary overhead sand bin having discharge ports vertically above said machine, a. wheel supported traveling crane movable to position above said machine for bringing and removing the flasks to and from said j olt-ramming machine, a vertically movable sand compactor having a position above the travel of said crane and capable of being lowered upon the flask, said compactor being apertured to permit the discharge therethrough of the sand from the bin to a flask on the jolt-ramming machine, substantially as described.

8. In a jolt-ramming machine, a sand compactor comprising a skeleton grid through which sand may be fed to the mold flask, means for suspending the same out of contact with the sand in the flask during the preliminary jolt ramming of the sand in the latter and then lowering the grid upon the sand in the flask, said grid having on its lower face pads lying in different planes and out of register in depth with the contour of the pattern in the flask and serving to compact the sand in the latter to different densities in different parts of the flask.

In testimony whereof I have signed my name to this specification, the presence of two subscribing witnesses.

ROBERT E. RUST.

Witnesses lV. M. JOYNER, G. E. MORRIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents,

Washington, D. G. 

